12
CONCEPT OF MULTIPLE CPU SYSTEM
12.4 Access Ranges Between a CPU Module and Other Modules
12.4.1 Access to controlled modules
12 - 13
9
DEVICE DESCRIPTION
10
MULTIPLE CPU SYSTEM
OVERVIEW
11
MULTIPLE CPU SYSTEM
CONFIGURATION
12
CONCEPT OF MULTIPLE
CPU SYSTEM
13
COMMUNICATIONS
BETWEEN CPU
MODULES
14
PARAMETERS ADDED
FOR MULTIPLE CPU
SYSTEMS
15
STARTING A MULTIPLE
CPU SYSTEM
16
TROUBLESHOOTING
12.4 Access Ranges Between a CPU Module and Other Modules
12.4.1 Access to controlled modules
A CPU module can read and write buffer memory data of the I/O modules and intelligent
function modules that are controlled by the CPU module. ( Page 4-4, Section 4.2)
12.4.2 Access to non-controlled modules
CPU modules can read the following data based on the multiple CPU settings parameters.
• Input (X) on/off data of non-controlled modules
• Output (Y) on/off data of other CPUs
This allows on/off data of the following modules controlled by another CPU to be used as
an interlock for the host CPU, and also the output status of external devices controlled by
other CPUs can be checked.
• Input module
• I/O combined module
• Intelligent function module
Data in the buffer memory of a non-controlled intelligent function module can be read out
regardless of the parameters set in the Multiple CPU settings.
However, a non-control CPU cannot perform the following processing on non-controlled
modules.
• Output on/off data to output modules
• Output on/off data to I/O combined modules
• Output on/off data to intelligent function modules
• Write to the buffer memory of intelligent function modules
Table 12.9 indicates accessibility to non-controlled modules in the multiple CPU system.
: Accessible, : N/A
Table 12.9 Accessibility to non-controlled modules
Access target
I/O sharing when using Multiple CPUs
Disabled (Unchecked) Enabled (Checked)
Input (X)
Output (Y)
Read
Write
Buffer memory of intelligent
function module
Read
Write
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